Buggy code:
public static final char [ ] append ( char [ ] array , char suffix ) { } public static final char [ ] append ( char [ ] target , int index , char [ ] array , int start , int end ) { } public static final char [ ] [ ] arrayConcat ( char [ ] [ ] first , char [ ] [ ] second ) { } public static final boolean camelCaseMatch ( char [ ] pattern , char [ ] name ) { } public static final boolean camelCaseMatch ( char [ ] pattern , int patternStart , int patternEnd , char [ ] name , int nameStart , int nameEnd ) { } public static String [ ] charArrayToStringArray ( char [ ] [ ] charArrays ) { } public static String charToString ( char [ ] charArray ) { } public static final char [ ] [ ] arrayConcat ( char [ ] [ ] first , char [ ] second ) { } public static final int compareWith ( char [ ] array , char [ ] prefix ) { } public static final char [ ] concat ( char [ ] first , char [ ] second ) { } public static final char [ ] concat ( char [ ] first , char [ ] second , char [ ] third ) { } public static final char [ ] concat ( char [ ] first , char [ ] second , char separator ) { } public static final char [ ] concat ( char [ ] first , char sep1 , char [ ] second , char sep2 , char [ ] third ) { } public static final char [ ] concat ( char prefix , char [ ] array , char suffix ) { } public static final char [ ] concatWith ( char [ ] name , char [ ] [ ] array , char separator ) { } public static final char [ ] concatWith ( char [ ] [ ] array , char [ ] name , char separator ) { } public static final char [ ] concatWith ( char [ ] [ ] array , char separator ) { } public static final boolean contains ( char character , char [ ] [ ] array ) { } public static final boolean contains ( char character , char [ ] array ) { } public static final boolean contains ( char [ ] characters , char [ ] array ) { } public static final char [ ] [ ] deepCopy ( char [ ] [ ] toCopy ) { } public static final boolean endsWith ( char [ ] array , char [ ] toBeFound ) { } public static final boolean equals ( char [ ] [ ] first , char [ ] [ ] second ) { } public static final boolean equals ( char [ ] [ ] first , char [ ] [ ] second , boolean isCaseSensitive ) { } public static final boolean equals ( char [ ] first , char [ ] second ) { } public static final boolean equals ( char [ ] first , char [ ] second , int secondStart , int secondEnd ) { } public static final boolean equals ( char [ ] first , char [ ] second , int secondStart , int secondEnd , boolean isCaseSensitive ) { } public static final boolean equals ( char [ ] first , char [ ] second , boolean isCaseSensitive ) { } public static final boolean fragmentEquals ( char [ ] fragment , char [ ] name , int startIndex , boolean isCaseSensitive ) { } public static final int hashCode ( char [ ] array ) { } public static boolean isWhitespace ( char c ) { <START_BUG> return ( c < ( ScannerHelper . MAX_OBVIOUS ) ) && ( ( ScannerHelper . C_SPACE ) == ( ScannerHelper . OBVIOUS_IDENT_CHAR_NATURES [ c ] ) ) ; <END_BUG> } public static final int indexOf ( char toBeFound , char [ ] array ) { } public static final int indexOf ( char [ ] toBeFound , char [ ] array , boolean isCaseSensitive ) { } public static final int indexOf ( final char [ ] toBeFound , final char [ ] array , final boolean isCaseSensitive , final int start ) { } public static final int indexOf ( final char [ ] toBeFound , final char [ ] array , final boolean isCaseSensitive , final int start , final int end ) { } public static final int indexOf ( char toBeFound , char [ ] array , int start ) { } public static final int indexOf ( char toBeFound , char [ ] array , int start , int end ) { } public static final int lastIndexOf ( char toBeFound , char [ ] array ) { } public static final int lastIndexOf ( char toBeFound , char [ ] array , int startIndex ) { } public static final int lastIndexOf ( char toBeFound , char [ ] array , int startIndex , int endIndex ) { } public static final char [ ] lastSegment ( char [ ] array , char separator ) { } public static final boolean match ( char [ ] pattern , char [ ] name , boolean isCaseSensitive ) { } public static final boolean match ( char [ ] pattern , int patternStart , int patternEnd , char [ ] name , int nameStart , int nameEnd , boolean isCaseSensitive ) { } public static final boolean pathMatch ( char [ ] pattern , char [ ] filepath , boolean isCaseSensitive , char pathSeparator ) { } public static final int occurencesOf ( char toBeFound , char [ ] array ) { }

Fix:
return ( c < ( ScannerHelper . MAX_OBVIOUS ) ) && ( ( ( ScannerHelper . OBVIOUS_IDENT_CHAR_NATURES [ c ] ) & ( ScannerHelper . C_JLS_SPACE ) ) != 0 ) ;